faulty AY160D-4HF12 power board

[galrock]

I Have received a TV that someone worked on and removed the following components
Q4, C27 and R41
from the colors of R41 from photos online it is a 0.3ohm resistor but I can't find any schematic of the board online.

Any help would be greatly appreciated

posts mentioning the same board are
https://www.badcaps.net/forum/showthread.php?t=72436&highlight=ay160d
and
https://www.badcaps.net/forum/showth...ghlight=ay160d

[arizanotlari]

Re: faulty AY160D-4HF12 power board

Q4 : 13N50
R41 : 10Kohm

[galrock]

Re: faulty AY160D-4HF12 power board

Q4 : 13N50
R41 : 10Kohm

thank you, any idea on c27?

[R_J]

Re: faulty AY160D-4HF12 power board

R41 can't be 10k it is 0.3Ω It is the fet's source resistor.

[galrock]

Re: faulty AY160D-4HF12 power board

Also pretty sure from colours in photos that it is 0.3
But can't figure out c27

[R_J]

Re: faulty AY160D-4HF12 power board

I looked a a few power supply schematics and the value for C27 could be around 20~220 pf and the originals are usually 1KV but its best to use a 2KV replacement
Samsung board BN44-00338B uses a 12N50 mosfet and the cap from drain to hot ground is a 220pf/2kv so it might be similar

[budm]

Re: faulty AY160D-4HF12 power board

What is the P/N printed on SMPS IC1?
C27 is the snubber cap for MOSFET Q4, it is connected to Source and Drain of Q4, typical value is 220 ~ 330 pf 2KV.
The application circuit of IC1 may show the value of snubber cap.

[arizanotlari]

Re: faulty AY160D-4HF12 power board

R41 can't be 10k it is 0.3Ω It is the fet's source resistor.

[galrock]

Re: faulty AY160D-4HF12 power board

What is the P/N printed on SMPS IC1?
C27 is the snubber cap for MOSFET Q4, it is connected to Source and Drain of Q4, typical value is 220 ~ 330 pf 2KV.
The application circuit of IC1 may show the value of snubber cap.

Logo is of ST
From what I can read there is
L6562A
And
GZ344
But I can be wrong, will attempt to upload the best photo I can of the IC